Owners of the high-rise Museum Tower condo building have amped up their tactics in a battle over reflected sunlight bombarding the neighboring Nasher Sculpture Center, but the PR blitz mustn’t obscure the owners’ obligation to take full responsibility. And that means addressing the problem at its source.

The unwanted glare emanates from the shiny exterior of the glass-wrapped luxury tower. That’s where the problem should be solved.

The tower’s owner, the Dallas Police and Fire Pension System, is touting a $5 million offer to bankroll a roof replacement for the Nasher gallery and pay for any damage from heating up the outside garden viewing area.

That offer is as condescending as it is dismissive. It was well-known in the Dallas Arts District that the late Ray Nasher fretted about harsh light flooding into his namesake gallery. When Nasher opened the center in 2003, critics applauded architect Renzo Piano’s honeycombed roof screen for the way it aimed thousands of light receptors toward blue sky, avoiding direct sun while bathing indoor galleries with soft natural light.

The receptors now stare at the mirrorlike side of the recently completed Museum Tower, a problem that should have been foreseen and avoided by the high-rise’s designers.

On sunny days, harsh light splashes into the gallery despite translucent panels installed across the ceiling to ward off the glare. Some artwork has been moved from the main gallery to protect it. This is no way for a renowned museum to have to operate.

The developers’ proposed fix is swapping out Piano’s roof — like just another set of Venetian blinds — with one that orients light receptors in a different direction.

Nasher’s people say the proposal would cut indirect light into the gallery by about 55 percent, badly misjudges the complexity of the roof design and underestimates the potential cost. Plus, the glare’s impact on the outdoor garden is dismissed and ignored.

With the impasse nearing the two-year mark, the two sides should not be so far apart. Museum Tower pushed ahead on its proposed fix after negotiations fell apart last fall with superlawyer Tom Luce as mediator.

The stated goal was a “100 percent solution,” but that will remain out of reach as long as the condo developers insist on making changes to someone else’s property instead of their own.

A satisfactory outcome will inevitably mean compromise on both sides, and we would hope to see some give from the Nasher down the road.

In the meantime, the Museum Tower owners might look to another high-profile arts project for inspiration on taking responsibility.

In Los Angeles, the undulating, steel-wrapped Walt Disney Concert Hall opened in 2003, the creation of acclaimed architect Frank Gehry. Portions of the hall’s exterior reflected so much light that it caused a nuisance to nearby condominiums, drivers and pedestrians.

Gehry’s firm agreed to own the mistake and later fixed it by sanding off the sheen that was blinding the Disney’s neighbors.

It’s that kind of neighborliness that’s needed in the Dallas Arts District today.